Failure of exogenous apoprotein E-3 to enhance cholesterol egress from J-774 murine macrophages in culture.

Abstract:

:HDL has been shown to enhance the removal of cholesterol from cultured fibroblasts, smooth muscle cells and macrophages, but fails to stimulate cholesterol removal from J-774 macrophages. Since J-774 macrophages do not synthesize or secrete apolipoprotein E, the effect of exogenous apolipoprotein E on HDL-mediated cellular cholesterol efflux was studied in this cell line. In cholesterol loaded J-774 macrophages total cellular cholesterol increased up to 6-7-fold, mainly cholesteryl esters. HDL3 removed up to 30% of total cellular cholesterol with a decrease in cholesteryl ester levels while free cholesterol levels remained unchanged. HDL3 was slightly superior to albumin in promoting cellular cholesterol removal. Exogenous apo E, over a wide range of apo E concentrations, did not enhance the ability of HDL3 to remove cellular cholesterol from cholesterol loaded J-774 cells. Exogenous apo E did not promote HDL-mediated cholesterol efflux from cells, thus suggesting a possible role for the intracellular route of newly synthesized apo E in these processes.

journal_name

Atherosclerosis

journal_title

Atherosclerosis

authors

Granot E,Eisenberg S

doi

10.1016/0021-9150(94)05475-x

subject

Has Abstract

pub_date

1995-04-07 00:00:00

pages

115-22

issue

1

eissn

0021-9150

issn

1879-1484

pii

0021-9150(94)05475-X

journal_volume

114

pub_type

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